JP2023106102A - Terminal device, base station device, control method, and program for suppressing influence of interference on communication in adjacent frequency bands - Google Patents

Abstract

To provide a terminal device, a base station device, and a program that sufficiently suppress an influence of interference on adjacent frequency bands in a cellular communication system that flexibly operates radio resources.SOLUTION: A terminal device 102 acquires, from a first base station device 101 belonging to a first communication system using a first frequency band, setting information indicating a measurement setting in a second frequency band, which is different from the first frequency band and used in a second communication system, S501, measures a predetermined signal transmitted from a second base station device 111 belonging to the second communication system on the basis of the setting information S504, notifies the first base station device 101 of a measurement result S506, and communicates with the first base station device 101 according to scheduling performed by the first base station device 101 on the basis of, the measurement result S509.SELECTED DRAWING: Figure 5

Description

The present invention relates to technology for suppressing the influence of interference on communications in adjacent frequency bands.

In a cellular communication system, generally, a downlink signal in the direction from a base station apparatus to a terminal apparatus and an uplink signal in the direction from the terminal apparatus to the base station apparatus are separated by time and frequency band, and their It keeps the signals from interfering with each other. Such a technique can sufficiently suppress interference in communications by a single carrier. In addition, even in communications by multiple telecommunications carriers, the same method is used to separate uplinks and downlinks, and sufficient guard bands are provided between adjacent frequency bands to sufficiently suppress interference. can do.

Wireless communication has come to be used for various purposes, and flexible operation is required even in cellular communication systems. In such a situation, interference may occur that would not occur conventionally. For example, a situation can be assumed in which an uplink signal is transmitted by a second carrier in a frequency band adjacent to a frequency band in which a downlink signal is transmitted by the first carrier. In such a situation, the distance between the terminal devices may be extremely close, so even if a guard band is provided, the out-of-band component of the uplink signal of the second carrier may is strongly received by the terminal device, and may interfere with the downlink signal. In particular, since the terminal device can be configured to collectively receive signals in a certain frequency band including frequency bands of a plurality of telecommunications carriers, among the signals received by the terminal device of the first telecommunications carrier , the component of the uplink signal of the second communication carrier becomes dominant in terms of power, and the downlink signal addressed to the device itself may be buried.

INDUSTRIAL APPLICABILITY The present invention provides a technique capable of sufficiently suppressing the influence of interference to adjacent frequency bands in a cellular communication system that flexibly manages radio resources.

A terminal device according to an aspect of the present invention uses a frequency band different from the first frequency band and used in a second communication system from a first base station device belonging to a first communication system that uses a first frequency band. acquisition means for acquiring setting information indicating measurement settings in a second frequency band, and measuring a predetermined signal transmitted from a second base station apparatus belonging to the second communication system based on the setting information; reporting means for notifying the first base station apparatus of the result of the measurement; and the first base station apparatus according to scheduling performed by the first base station apparatus based on the result of the measurement. and communication means for communicating with.

A base station apparatus according to another aspect of the present invention is a base station apparatus belonging to a first communication system using a first frequency band, different from the first frequency band and in the second communication system Notification means for notifying the terminal device of setting information indicating the setting of measurement in the second frequency band to be used; receiving means for receiving a measurement result of a predetermined signal transmitted from a base station apparatus; and based on the measurement result, using a predetermined frequency resource included in the first frequency band in a predetermined time resource. Scheduling means for determining whether or not the terminal device is permitted to transmit a signal, and scheduling communication with the terminal device based on the determination.

Advantageous Effects of Invention According to the present invention, it is possible to sufficiently suppress the influence of interference on adjacent frequency bands in a cellular communication system that flexibly manages radio resources.

1 is a diagram showing an example of a communication environment; FIG. It is a figure which shows the hardware structural example of a base station apparatus and a terminal device. It is a figure which shows the functional structural example of a terminal device. It is a figure which shows the functional structural example of a base station apparatus. FIG. 4 is a diagram showing an example of the flow of processing to be executed;

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. It should be noted that the following embodiments do not limit the invention according to the claims, and not all combinations of features described in the embodiments are essential to the invention. Two or more of the features described in the embodiments may be combined arbitrarily. Also, the same or similar configurations are denoted by the same reference numerals, and redundant explanations are omitted.

(Communication environment)
FIG. 1 shows an example of a communication environment considered in this embodiment. In the environment of FIG. 1, for example, there are multiple wireless communication systems that comply with the 5th Generation (5G) cellular wireless communication standard specified by the 3rd Generation Partnership Project (3GPP). In this environment, for example, the first base station device 101 and the first terminal device 102 belonging to the first wireless communication system provided by the first communication carrier, and Assume that there are a second base station apparatus 111 and a second terminal apparatus 112 belonging to a second wireless communication system provided by a second carrier. Note that this is an example, and wireless communication systems operating according to other standards may be used, and there may be more than two wireless communication systems. Also, although FIG. 1 shows only one base station apparatus and one terminal apparatus belonging to each wireless communication system, more base station apparatuses and terminal apparatuses may naturally exist. Here, an example is shown in which there are two wireless communication systems provided by two telecommunications carriers, respectively. may be a local 5G system. In other words, as long as the operator is different, the wireless communication system need not be provided by a carrier.

In this embodiment, the first radio communication system uses a first frequency band, and the second radio communication system uses a second frequency band different from the first frequency band. In one example, the first frequency band and the second frequency band are adjacent frequency bands, but may be frequency bands that are not adjacent. For example, both the first terminal device 102 and the second terminal device 112 collectively receive signals of frequency bands including both the first frequency band and the second frequency band, and the received signals , and extracts the signal addressed to its own device by executing processing such as Fourier transform. At this time, for example, the second terminal device 112 can perform Fourier transform using the reception timing of the signal from the second base station device 111 as a reference.

Here, it is assumed that frame synchronization has been established in the first wireless communication system and the second wireless communication system, and that the uplink and downlink timings match. In this case, even if the second terminal apparatus 112 receives the signal from the first base station apparatus 101, since the signal is synchronized with the signal from the second base station apparatus 111, the signal is orthogonalized. Since the reliability is ensured, interference from the first base station apparatus 101 can be ignored. On the other hand, there is a demand to improve the degree of freedom of wireless communication systems in order to meet various wireless communication needs. Therefore, for example, it is assumed that each wireless communication system independently determines the timing of uplink and downlink. In this case, the signal from the first terminal device 102 arrives at the second terminal device 112 in parallel with the signal from the second base station device 101 . At this time, for example, the first terminal device 102 transmits a signal earlier than the frame reference timing so that it reaches the first base station device 101 at a predetermined timing. The signal from the station apparatus 111 and the frame timing do not match, and in the second terminal apparatus 112, orthogonality is not ensured during the Fourier transform, and interference at a level that cannot be ignored can occur. In particular, when the positions of the first terminal device 102 and the second terminal device 112 are close to each other, the second terminal device 112 receives a signal from the first terminal device 102 with very high power. sell. However, when the second terminal device 112 can receive the signal from the second base station device 111 with sufficient power, the influence of the signal from the first terminal device 102 is relatively small. can do.

In view of such circumstances, the present embodiment enables the first terminal device 102 to detect the signal of the second wireless communication system. Then, when the signal of the second wireless communication system is detected with sufficiently high power in the first terminal device 102, terminals of the second wireless communication system existing around the first terminal device 102 It is assumed that the device (eg, the second terminal device 112) is able to receive the signal of the second wireless communication system with sufficient strength. Therefore, in such a situation, even if the first terminal device 102 transmits a signal, it is assumed that the influence of the signal on the second wireless communication system will be sufficiently small. Therefore, it can be determined that there is no need to perform control to reduce the influence of interference when the first terminal apparatus 102 transmits a signal. On the other hand, when the signal of the second wireless communication system is detected at the power equal to or lower than the predetermined power in the first terminal device 102, the second wireless communication system existing around the first terminal device 102 It is expected that the reception strength of the signal of the second wireless communication system will be relatively low at the terminal of the system (eg, the second terminal 112). Therefore, when the first terminal device 102 transmits a signal, it is expected that the signal will have a large impact on the second wireless communication system. For this reason, it can be determined that it is necessary to perform control to reduce the influence of interference when the first terminal apparatus 102 transmits a signal. When the signal of the second wireless communication system is not detected, it may be handled in the same way as when the received power of the signal is equal to or less than the predetermined power, but it is assumed that the second wireless communication system does not exist. It may be determined that the signal transmitted by the first terminal device 102 has no effect.

In this way, the first terminal device 102 can measure radio signals transmitted and received in a radio communication system different from the radio communication system to which the device belongs, and based on the measurement result, the first terminal device 102 Whether or not interference from signals transmitted from device 102 should be reduced is controlled. Note that the control to reduce interference may include, for example, control to prevent the first terminal device 102 from transmitting uplink signals during a period in which downlink communication is performed in the second wireless communication system. In addition, the control for reducing interference is, for example, a frequency sufficiently separated in the frequency domain from the second frequency band of the second wireless communication system in a period in which downlink communication is performed in the second wireless communication system. The resources may be used to allow transmission of uplink signals by the first terminal device 102 . That is, when the received power of the signal of the second wireless communication system is not sufficient around the first terminal device 102, the power leaked into the frequency resource in which the downlink signal can be transmitted in the second wireless communication system. can be scheduled such that . Scheduling can be performed, for example, by adjusting time resources and frequency resources so that the power of signal components leaking into frequency resources in which downlink signals can be transmitted in the second wireless communication system becomes equal to or less than a predetermined value. Note that scheduling may be performed in the second wireless communication system instead of being performed in the first wireless communication system. For example, when the first terminal device 102 transmits a signal, the second wireless communication is performed so that the wireless resource that causes interference with power above a certain level is not used for downlink communication in the second wireless communication system. Scheduling in the system may be performed.

In this embodiment, in order to perform the control as described above, for example, a radio resource control (RRC) message when the first terminal device 102 connects to the first base station device 101, the second wireless communication system is notified from the first base station apparatus 101 to the first terminal apparatus 102 . That is, the first base station apparatus 101 transmits setting information for measurement of the frequency band used in the second wireless communication system to the first terminal apparatus using an information element (IE) in the RRC message. 102. The first terminal device 102 parses the RRC message to obtain measurement configuration information from the IE containing information for measurements of other wireless communication systems. Note that the notification of the setting information using the RRC message is an example, and for example, the setting information may be notified not only to the terminal device in the connected state but also to the terminal device in the non-connected state using a broadcast signal. .

When setting information is notified using an RRC message, for example, the setting information can be notified by at least one of MeasObjectNR, MeasObjectCLI, and MeasReport of the RRC message. Also, new IEs may be defined that are included in RRC messages to signal configuration information for measurements of other wireless communication systems (eg, wireless communication systems provided by other carriers).

Here, the configuration information can include, for example, information indicating frequency bands in which measurements should be performed. The frequency band information here can include, for example, information on the second frequency band used in the second wireless communication system. The information indicating the frequency band for which measurement should be performed is any information that can identify the frequency band, such as information indicating the frequencies at the lower and upper ends of the frequency band, or an index assigned in advance to the frequency band. Possible. Also, the setting information may include information indicating a predetermined frequency to be measured, among frequency bands such as the second frequency band in which measurement is to be performed. Information indicating this predetermined frequency may include, for example, Absolute Radio-Frequency Channel Number (ARFCN). In one example, NR-ARFCN in the second wireless communication system may be notified as information indicating a predetermined frequency. The configuration information may also include the bandwidth of the frequency band (for example, the second frequency band) in which measurements should be made. Also, the setting information can include information indicating a signal to be measured. In one example, the information indicating the signal to be measured can be information indicating the positions of time resources and frequency resources through which the signal is transmitted. The position of this time resource may be, for example, information that directly specifies the time resource such as a frame number or time information, or information that indirectly specifies the time resource such as an offset value from a reference frame or time. There may be. Also, the position of the time resource may include period information. Further, the position of a frequency resource may be information that directly specifies a frequency resource such as a frequency value or an index of a resource block, or a reference frequency (for example, a frequency at the lower end or upper end of a frequency band). Information that indirectly specifies frequency resources, such as offset values, may also be used. Also, when the signal to be observed undergoes frequency hopping, information such as a hopping pattern may be used as information indicating the position of the frequency resource. The setting information may be any one of the above information, or may include a combination of two or more of these information. Moreover, information other than the above-mentioned information may be included as setting information.

Note that the signal to be measured can be, for example, a predetermined signal that is specified to be periodically transmitted on a predetermined frequency and time resource in the second wireless communication system. Predetermined signals may include, for example, synchronization signals and physical broadcast channel blocks (SSBs), or Non Cell-Defined (NCD)-SSBs. Note that SSB (or Cell-Defined (CD)-SSB) is a signal essential to the system. The SSB is periodically transmitted on specific frequency and time resources to establish downlink time synchronization and provide system information such as the Master Information Block (MIB). NCD-SSB is a signal that, like SSB, may be configured to be transmitted periodically on specific frequency and time resources, although it is not required in the system. Also, the predetermined signal may be a predetermined reference signal in one example. As this reference signal, an existing reference signal may be used, or a new reference signal may be defined for measurement by a terminal device of another radio communication system. If a predetermined signal to be measured is determined in advance, information indicating the signal to be measured may not be sent from first base station apparatus 101 to first terminal apparatus 102 .

In addition, the first base station apparatus 101 can notify the first terminal apparatus 102 of information that enables identification of the frequency and time resource in which the predetermined signal is transmitted. The first base station apparatus 101 may acquire information on the frequency and time resource for transmitting a predetermined signal from the second base station apparatus 111, or may obtain information on the communication that provides the first wireless communication system, for example. It may be stored in advance through presetting by the business operator or the like. As the information that can specify the frequency and time resource for transmitting the predetermined signal, the above-described frequency band information, frequency bandwidth information, and frequency information related to the predetermined signal such as ARFCN are used. may That is, frequency band information, frequency bandwidth information, and frequency information such as ARFCN can be pre-determined so that the frequency and time resource in which a given signal is transmitted can be identified. Note that, for example, when the predetermined signal is SSB and ARFCN information is not acquired, the first terminal apparatus 102 performs a search for each frequency band to be measured, and detects SSB. can be

The first terminal device 102 measures a predetermined signal (for example, SSB or NCD-SSB) transmitted from the second base station device 111 based on the setting information acquired as described above, and the measurement result is notified to the first base station apparatus 101 . A result of the measurement may include, for example, information indicative of the received power of the given signal. In one example, the result of the measurement may be the reference signal received power (RSRP) when the predetermined signal to be measured is the reference signal. Also, SS-RSRP based on the synchronization signal may be used as the result of the measurement. Also, a difference value of RSRP from a predetermined value (eg, a previously reported RSRP measurement value or another RSRP measurement value reported together) may be reported. Further, as a result of measurement, for example, frequency information such as ARFCN in a frequency band in which a predetermined signal is detected at a predetermined power or less (or above a predetermined power) may be notified. In addition, other information that can specify the frequency band in which a predetermined signal is detected below (or above) a predetermined power may be reported as a result of the measurement.

A condition (event) for this notification may be set. The first terminal apparatus 102 may notify the first base station apparatus 101 of the measurement result when the conditions for notification are satisfied. Note that the first terminal device 102 may periodically notify, for example. In addition, the condition for notification may include, for example, that a predetermined signal of the second wireless communication system is detected at a predetermined power or less. That is, under the condition that when the first terminal device 102 transmits a signal, interference of a predetermined level or higher is possible, measurement from the first terminal device 102 to the first base station device 101 is performed. notification of the results of The conditions for notification may also include, for example, that a predetermined signal of the second wireless communication system has been detected above a predetermined power. That is, even if the first terminal apparatus 102 transmits a signal, the interference level given by the signal is sufficiently low compared to the received power of the signal from the second base station apparatus 111. The measurement result may be reported from one terminal device 102 to the first base station device 101 . Also, the condition for notification may include expiration of a predetermined timer that is started when setting information for measurement is notified. That is, the first terminal apparatus 102 may notify the first base station apparatus 101 of the measurement result when a certain period of time has elapsed after acquiring the setting information. The notification conditions may be notified from the first base station apparatus 101 to the first terminal apparatus 102 together with the setting information, for example, or may be set in advance when the first terminal apparatus 102 is manufactured, for example. may have been Also, the conditions for notification may be any one or more of the above conditions, or may include conditions other than the above conditions.

When the first base station apparatus 101 receives the measurement result report as described above from the first terminal apparatus 102, the first base station apparatus 101 schedules communication with the first terminal apparatus 102 based on the measurement result. do. For example, the first base station apparatus 101 uses a predetermined frequency included in the first frequency band used in the first wireless communication system in a predetermined time resource when the second base station apparatus 111 transmits a signal. The resource is used to determine whether or not to allow the first terminal device 102 to transmit a signal. That is, the first base station apparatus 101 allocates to the first terminal apparatus 102 a predetermined frequency resource that may interfere with communication in the second frequency band when the first terminal apparatus 102 transmits a signal. based on the results of the measurements. For example, when the first terminal device 102 detects a predetermined signal in the second frequency band at a predetermined power or less, the first base station device 101 detects the predetermined frequency in the above-described predetermined time resource. It may be determined that resources should not be allocated to the first terminal 102 . In this case, for example, the first base station apparatus 101 may allocate another frequency resource different from the predetermined frequency resource to the signal transmission of the first terminal apparatus 102 in a predetermined time resource. The first terminal device 102 may not be allowed to transmit signals during the time resource. Also, the first base station apparatus 101 may perform downlink signal transmission to the first terminal apparatus 102 in the predetermined time resource. In this way, the first base station apparatus 101 performs scheduling so that the influence of interference on the second wireless communication system due to the signal transmission of the first terminal apparatus 102 is sufficiently reduced, and according to the scheduling, the first base station apparatus 101 communication with one terminal device 102 is performed. Note that this is just an example, and the first base station apparatus 101 may notify the second base station apparatus 111 of the measurement result, for example, so as not to transmit the signal in that predetermined time resource.

In this embodiment, as described above, the first terminal device 102 is enabled to measure downlink signals in the second wireless communication system, and based on the measurement result, the first terminal device 102 scheduling. This makes it possible to suppress the influence of the signal transmission of the first terminal device 102 on the communication (especially downlink communication) in the second wireless communication system.

(Device configuration)
A hardware configuration example of the first base station apparatus 101 and the first terminal apparatus 102 will be described with reference to FIG. The 1st base station apparatus 101 and the 1st terminal device 102 are comprised including the processor 201, ROM202, RAM203, the memory|storage device 204, and the communication circuit 205 in an example. The processor 201 is a computer including one or more processing circuits such as a general-purpose CPU (Central Processing Unit) and ASIC (Application Specific Integrated Circuit). By reading and executing the program stored in the device, the overall processing of the device and each of the above-described processings are executed. The ROM 202 is a read-only memory that stores programs related to processing executed by the first base station apparatus 101 and the first terminal apparatus 102 and information such as various parameters. A RAM 203 is a random access memory that functions as a work space when the processor 201 executes programs and stores temporary information. The storage device 204 is configured by, for example, a detachable external storage device or the like. The communication circuit 205 is configured by, for example, a circuit for wireless communication such as LTE or 5G. Although one communication circuit 305 is illustrated in FIG. 2, the first base station apparatus 101 and the first terminal apparatus 102 can have multiple communication circuits. For example, the first base station apparatus 101 and the first terminal apparatus 102 can have a common antenna with the radio communication circuits for LTE and 5G. Note that the first base station apparatus 101 and the first terminal apparatus 102 may have separate antennas for LTE and 5G. Also, the first base station device 101 may have, for example, a communication circuit for wired communication for communication with other base station devices or network nodes, and the first terminal device 102 may be connected to a wireless LAN or the like. communication circuitry for other wireless communication systems. Note that the first base station apparatus 101 and the first terminal apparatus 102 may have separate communication circuits 205 for each of a plurality of usable frequency bands, or at least part of those frequency bands may have a common communication circuit 205 for them.

FIG. 3 is a diagram showing a functional configuration example of the first terminal device 102. As shown in FIG. The first terminal device 102 includes, for example, a setting information acquisition unit 301, a measurement unit 302, a measurement result notification unit 303, and a communication control unit 304 as its functions. Note that these functional units can be implemented by the processor 201 executing programs stored in the ROM 202 and the storage device 204, for example. Since the processing to be executed by the first terminal device 102 has been described above, the functional configuration of the first terminal device 102 will be roughly described here, and the details will not be repeated.

Configuration information acquisition section 301 obtains configuration information for measuring a signal transmitted from second base station apparatus 111 in a second wireless communication system different from the first wireless communication system to which first terminal apparatus 102 belongs. is acquired from the first base station apparatus 101 . This configuration information enables the first terminal device 102 to measure a predetermined signal that is periodically transmitted from the second base station device 111 over a predetermined frequency and time resource, as described above. information. In addition, in the case where the information of the predetermined signal transmitted from the second base station apparatus 111 is held in advance in the first terminal device 102, or in the case where the predetermined signal can be detected without the specific information. , for example, only information indicating that signals of other systems should be measured may be acquired as setting information. The setting information acquisition unit 301 may acquire information indicating conditions for notifying the measurement result together with the setting information. Note that the information indicating the conditions may be notified as one element of the setting information. Measurement section 302 measures a predetermined signal (for example, SSB, NCD-SSB, etc.) transmitted from second base station apparatus 111 based on the configuration information acquired by configuration information acquisition section 301 . Measuring section 302 measures, for example, the received power level of a predetermined signal. Measurement result notification section 303 notifies first base station apparatus 101 of the measurement result obtained by measurement section 302 . Note that when a condition for notifying the measurement result is set, the measurement result notification unit 303 notifies the first base station apparatus 101 of the measurement result when the condition is satisfied. Notice. Communication control section 304 controls communication with first base station apparatus 101 according to scheduling performed by first base station apparatus 101 based on the measurement result.

FIG. 4 is a diagram showing a functional configuration example of the first base station apparatus 101. As shown in FIG. The first base station apparatus 101 includes, for example, a configuration information notification section 401, a measurement result reception section 402, and a scheduling section 403 as its functions. Note that these functional units can be implemented by the processor 201 executing programs stored in the ROM 202 and the storage device 204, for example. Since the processing to be executed by first base station apparatus 101 has been described above, the functional configuration of first base station apparatus 101 will be roughly described here, and the details will not be repeated.

Setting information notification section 401 transmits a signal transmitted from second base station apparatus 111 of a second wireless communication system different from the first wireless communication system to which first base station apparatus 101 belongs to the first terminal apparatus. 102 notifies the first terminal device 102 of setting information for measurement. This configuration information enables the first terminal device 102 to measure a predetermined signal that is periodically transmitted from the second base station device 111 over a predetermined frequency and time resource, as described above. information. In addition, in the case where the information of the predetermined signal transmitted from the second base station apparatus 111 is held in advance in the first terminal device 102, or in the case where the predetermined signal can be detected without the specific information. , for example, only information indicating that signals of other systems should be measured may be notified as setting information. Also, the setting information notification unit 401 may acquire information indicating the conditions for notifying the measurement result together with the setting information. Note that the information indicating the conditions may be notified as one element of the setting information. The measurement result receiving section 402 receives from the first terminal apparatus 102 the result of the measurement of the signal from the second base station apparatus 111 performed by the first terminal apparatus 102 based on the notified setting information. Scheduling section 403 estimates the influence of the signal transmitted from first terminal apparatus 102 on the communication of the second wireless communication system based on the measurement results. Then, scheduling section 403 gives a predetermined level of interference to the second frequency band when first terminal apparatus 102 transmits a signal in a predetermined time resource in which second base station apparatus 111 transmits a signal. available radio resources for signaling of the first terminal device 101 is allowed. Scheduling section 403 performs scheduling for communication of first terminal apparatus 102 based on the determination result. Note that these are only examples, and the first base station apparatus 101 negotiates with the second base station apparatus 111, and during the period in which the first terminal apparatus 102 transmits a signal, the second base station apparatus 101 The station apparatus 111 may not transmit signals in frequency resources that are affected by the transmission signal of the first terminal apparatus 102 at a predetermined level. That is, there are various variations in how to use the measurement results, and the scheduling section 403 may schedule the communication of the first terminal device 102 in the same manner as the normal procedure.

(Processing flow)
Next, an example of the flow of processing executed in the first base station apparatus 101 and the first terminal apparatus 102 belonging to the first wireless communication system will be described with reference to FIG. Since the processing executed by the first base station apparatus 101 and the first terminal apparatus 102 is as described above, the flow of processing will be outlined here, and details thereof will not be repeated.

First, the first base station apparatus 101 transmits in a second wireless communication system to which the own apparatus and the first terminal apparatus 102 do not belong (and it is assumed that the first terminal apparatus 102 will not connect). An instruction is sent to the first terminal device 102 to observe a predetermined downlink signal that is to be changed. At this time, the first base station apparatus 101 transmits configuration information enabling measurement to the first terminal apparatus 102 (S501). Note that the first base station apparatus 101, for example, transmits this instruction and setting information by means of an RRC message when the first terminal apparatus 102 executes connection processing, and by the first terminal apparatus 102 in a connected state, Measurements can be made. However, this is only an example. For example, the terminal device in the RRC_Idle state observes the downlink signal of the second wireless communication system, stores it as a log, and notifies the log when the connected state is established. The first terminal device 102 may be configured as follows. In this case, the first base station apparatus 101 may notify the setting information for acquiring the log while the first terminal apparatus 102 is in the connected state, or may notify the first terminal apparatus 102 in the RRC_Idle state. The configuration information may be communicated through system information so that the device 102 can obtain the configuration information. The terminal device 102 retains the setting information notified in S501, and enters a state in which measurement based on the setting information can be executed (S502).

After that, a predetermined signal is transmitted from the second base station apparatus 111 belonging to the second wireless communication system (S503), and the first terminal apparatus 102 measures the predetermined signal using the setting information (S504). ). Note that the predetermined signal here is SSB or NCD-SSB, but a signal other than these may be used as the predetermined signal. The first terminal device 102 reports the result of the measurement in S504 to the first base station device 101 (S506). For example, when the first terminal device 102 acquires a condition for notifying the measurement result in S501, or when such a condition is set in advance by a standard or the like, the condition is satisfied. After confirming that the measurement has been performed (S505), the measurement result can be reported (S506).

Upon receiving the measurement result, the first base station apparatus 101 performs scheduling for communication of the first terminal apparatus 102 based on the measurement result, and allocates resources to the communication of the first terminal apparatus 102. is determined (S507). For example, when the measurement result notification condition is set, the first base station apparatus 101 does not satisfy the condition (for example, the first terminal device 102, the predetermined signal of the second wireless communication system having a predetermined power or less was not detected), and scheduling based on the determination result can be executed. The first base station apparatus 101 allocates resources for downlink signal transmission and uplink signal reception to the first terminal apparatus 102 according to the determined scheduling (S508), and performs communication according to the resource allocation. It does (S509).

As described above, in the present embodiment, the first terminal device 102 measures downlink signals in the second wireless communication system to which the terminal device 102 does not belong (not assumed to be connected). It is possible to notify the measurement result to the base station apparatus 101 (network of the first wireless communication system). Then, the first wireless communication network considers the influence of interference caused by the signal transmitted by the first terminal device 102 on the signal received by the second terminal device 112 in the second wireless communication system, Determining resource allocation for (especially uplink) communications of the first terminal device 102 . This makes it possible to operate cellular communication systems flexibly while, for example, limiting the impact on communications in other wireless communication systems using adjacent frequency bands. It will be possible to contribute to Goal 9 of the SDGs, "Build resilient infrastructure, promote sustainable industrialization, and foster innovation."

The invention is not limited to the above embodiments, and various modifications and changes are possible within the scope of the invention.

Claims (22)

Configuration of measurements in a second frequency band different from the first frequency band and used in a second communication system from a first base station apparatus belonging to a first communication system using a first frequency band an acquisition means for acquiring setting information indicating
measuring means for measuring a predetermined signal transmitted from a second base station apparatus belonging to the second communication system based on the setting information;
notification means for notifying the first base station apparatus of the result of the measurement;
communication means for communicating with the first base station device according to scheduling performed by the first base station device based on the result of the measurement;
A terminal device comprising: 2. The terminal device according to claim 1, wherein said acquisition means acquires said setting information from an information element in a radio resource control (RRC) message when connecting to said first base station device. 3. The terminal device according to claim 2, wherein the information element includes at least one of MeasObjectNR, MeasObjectCLI, and MeasReport. The setting information specifies information indicating the second frequency band, information indicating a predetermined frequency to be measured in the second frequency band, the bandwidth of the second frequency band, and the predetermined signal. 4. The terminal device according to any one of claims 1 to 3, comprising at least one of information. 5. The predetermined signal is a signal defined to be periodically transmitted from the second base station apparatus on a predetermined frequency and time resource. The terminal device according to item 1. The terminal according to any one of claims 1 to 5, wherein the predetermined signal includes a synchronization signal and a physical broadcast channel block (SSB), or Non Cell-Defined (NCD)-SSB. Device. The obtaining means further obtains information indicating a condition for notifying the first base station apparatus of the result of the measurement,
7. The terminal apparatus according to any one of claims 1 to 6, wherein said notification means notifies said result of said measurement to said first base station apparatus when said condition is satisfied. 8. The terminal device according to claim 7, wherein said condition includes that said predetermined signal is detected with power equal to or lower than a predetermined power. The notification means notifies the first base station apparatus of at least one of information indicating the received power of the predetermined signal and information of a frequency related to the predetermined signal as the result of the measurement. 9. The terminal device according to any one of claims 1 to 8, characterized by: A base station device belonging to a first communication system that uses a first frequency band,
Notification means for notifying a terminal device of setting information indicating measurement settings in a second frequency band different from the first frequency band and used in a second communication system;
receiving means for receiving a measurement result of a predetermined signal transmitted from another base station apparatus belonging to the second communication system, which is performed by the terminal apparatus based on the setting information;
determining whether or not to allow the terminal device to transmit a signal using a predetermined frequency resource included in the first frequency band in a predetermined time resource based on the result of the measurement; scheduling means for scheduling communication with the terminal device based on
A base station device characterized by having: 11. The method according to claim 10, wherein the notifying means notifies the setting information using an information element in a radio resource control (RRC) message when the terminal device connects to the base station device. Base station equipment. 12. The base station apparatus according to claim 11, wherein said information element includes at least one of MeasObjectNR, MeasObjectCLI, and MeasReport. The setting information specifies information indicating the second frequency band, information indicating a predetermined frequency to be measured in the second frequency band, the bandwidth of the second frequency band, and the predetermined signal. 13. The base station apparatus according to any one of claims 10 to 12, including at least one of information. 3. The predetermined signal is a signal defined to be periodically transmitted on a predetermined frequency and time resource from another base station apparatus belonging to the second communication system. 14. The base station apparatus according to any one of 10 to 13. A base according to any one of claims 10 to 14, characterized in that said predetermined signals comprise synchronization signals and physical broadcast channel blocks (SSB) or Non Cell-Defined (NCD)-SSB. station equipment. 16. The method according to any one of claims 10 to 15, wherein said notifying means further notifies information indicating conditions for notifying said base station apparatus of said measurement result from said terminal apparatus. Base station equipment. 17. The base station apparatus according to claim 16, wherein said condition includes that said predetermined signal is detected with power equal to or lower than a predetermined power. 18. The measurement result according to any one of claims 10 to 17, wherein the measurement result includes at least one of information indicating received power of the predetermined signal and information of frequency related to the predetermined signal. The base station device according to the item. A control method performed by a terminal device,
Configuration of measurements in a second frequency band different from the first frequency band and used in a second communication system from a first base station apparatus belonging to a first communication system using a first frequency band Acquiring setting information indicating
measuring a predetermined signal transmitted from a second base station apparatus belonging to the second communication system based on the setting information;
Notifying the first base station device of the result of the measurement;
communicating with the first base station device according to scheduling performed by the first base station device based on the results of the measurements;
A control method comprising: A control method executed by a base station apparatus belonging to a first communication system using a first frequency band,
Notifying the terminal device of setting information indicating measurement settings in a second frequency band different from the first frequency band and used in a second communication system;
Receiving a measurement result of a predetermined signal transmitted from another base station apparatus belonging to the second communication system, which is performed by the terminal apparatus based on the configuration information;
determining whether or not to allow the terminal device to transmit a signal using a predetermined frequency resource included in the first frequency band in a predetermined time resource based on the result of the measurement; scheduling communications with the terminal device based on
A control method comprising: A program for causing a computer to function as the terminal device according to any one of claims 1 to 9. A program for causing a computer to function as the base station apparatus according to any one of claims 10 to 18.

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